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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 15 — Jul. 25, 2005
  • pp: 5750–5755

Direct measurement of the critical power of femtosecond Ti:sapphire laser pulse in air

W. Liu and S.L. Chin  »View Author Affiliations

Optics Express, Vol. 13, Issue 15, pp. 5750-5755 (2005)

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We report a simple experiment to directly determine the critical power for self-focusing in air by measuring the focal shift of the focused femtosecond Ti:sapphire laser pulses. The measured critical power is 10 GW for the 42 fs laser pulse; it gradually decreases to 5 GW for (chirped) pulse duration longer than 200 fs.

© 2005 Optical Society of America

OCIS Codes
(190.5530) Nonlinear optics : Pulse propagation and temporal solitons
(260.5950) Physical optics : Self-focusing

ToC Category:
Research Papers

Original Manuscript: June 24, 2005
Revised Manuscript: July 14, 2005
Published: July 25, 2005

W. Liu and S. Chin, "Direct measurement of the critical power of femtosecond Ti:sapphire laser pulse in air," Opt. Express 13, 5750-5755 (2005)

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